Grill brush



FIG. 1 is an isometric view of a grill brush in accordance with the new design;

FIG. 2 is a right side view thereof;

FIG. 3 is a left side view thereof;

FIG. 4 is a top view thereof; and

FIG. 5 is a bottom view thereof;

FIG. 6 is a front view thereof; and,

FIG. 7 is a rear view thereof.

The elements shown in broken lines illustrate portions of the grill brush that form no part of the claimed design. 

The ornamental design for a grill brush, as shown and described. 